NAME

       gbdummyfy - Produce dummies from labels

SYNOPSIS

       gbdummyfy [options]

DESCRIPTION

       This  command reads from standard input a text file with space separated columns. The entry in one column
       (the first by default) are considered labels and expanded into a matrix of dummies ,  i.e.  of  0  and  1
       values. The number of columns of the matrix is equal to the number of different labels. Each row contains
       '1'  in  the place of the associated labels in the sorted list of labels, and '0' everywehere else. Since
       in general one less dummy variable is required than the number of labels, you can remove  one  column  of
       dummies using the option '-d'.

OPTIONS

       -h     print this help

       -c     set the column of labels (default 1)

       -d     which column to remove, counting from 1 (default none)

       -v     print the labels and associated positions to standard error

EXAMPLES

       echo "a 1\nb 2" | gbdummyfy
              create a 4x3 marix with dummy values relative to labels 'a' and 'b'

       This  program requires awk or gawk. Notice that it simply expands the data adding new columns. When using
       the resulting the resulting matrix in other utilities, the user should specify explicitly  which  dummies
       variable to use and how.

       A  simple  linear  dependency  can  be  automatically  generated  for 'gblreg' by inserting the following
       expression in the functional specification

       `seq 3 12 | sed 's/\(.*\)/\+d\1\*x\1/' | tr -d '\n'`

       and

       `seq 3 12 | sed 's/\(.*\)/,\1=0/' | tr -d '\n'`

       among the initial conditions. In this case there are 10 different  values  for  the  dummy.  They  occupy
       column positions from 3 to 12 and their initial value is zero.

AUTHOR

       Written by Giulio Bottazzi

REPORTING BUGS

       Report bugs to <gbutils@googlegroups.com>

       Package home page <http://cafim.sssup.it/~giulio/software/gbutils/index.html>

COPYRIGHT

       Copyright © 2009-2015 Giulio Bottazzi

       This  program  is  free  software;  you  can  redistribute it and/or modify it under the terms of the GNU
       General Public License (version 2) as published by the Free Software Foundation.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY  WARRANTY;  without  even
       the  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
       License for more details.

gbdummyfy ver. 5.6                                 August 2017                                      GBDUMMYFY(1)